7
2.3
Pins Function Description
Table 2-2 Pins Function
Pin
Signal
I/O
Description
Notes
1
SPI_MOSI
O
SPI data
Master output, Slave input
2
SPI_CS
O
SPI chip select
3
SPI_CLK
O
SPI clock
4
TPO_MID
O
Ethernet transformer center
tap
Connect Center Tap
5
RSV
-
Reserved
6
VCC
Power
Power input
3.3V~5VDC
7
SPI_MISO
I
SPI data
Master input, Slave output
8
RXD3
I
COM3 input data reception
LVTTL
9
RESETIN_N
I
Reset input
LVTTL, low active (>5ms)
10
FRESET_N
I
Restore to factory default
setting (user configuration will
be reset)
LVTTL, low active (> 5s)
11
EVENT
I
Event input
LVTTL
12
RSV
-
Reserved
13
TXD3
O
COM3 output transmit data
LVTTL
14
GND
Power
15
TXD1
O
COM1 output transmit data
LVTTL
16
RXD1
I
COM1 input data reception
LVTTL
17
GND
Power
18
TXD2/SDA
O
COM2 output transmit data
/or I2C SDA
LVTTL
19
RXD2/SCL
I
COM2 input data reception
/or I2C SCL
LVTTL
20
GND
Power
21
PV
O
Position valid
High effective (RTK fix is
effective when UB482 works
as the rover; When UB482
works as the base station,
successful set up of the base
station and GPGGA status bit
at “7” will make the pin
effective). If LED indicator is
needed, lead the pin to the
anode of the LED diode.
22
GND
Power
